Set up grill for direct cooking over medium heat. Oil grate when ready to start cooking. For Maple-Dijon Sauce: In a small bowl, stir to combine mayonnaise , Dijon mustard, and 2 tablespoons maple syrup; set aside. For Turkey Burgers: In a medium bowl, mix together all ingredients for burgers. Wet hands to prevent sticking and shape into 4 patties. Place burgers on hot oiled grill for 5 to 6 minutes per side or until done. Serve on buns with traditional burger condiments and a dollop of maple-Dijon sauce. Note - Indoor: Prepare burgers as directed. Heat 2 tablespoons of oil in a large skillet or frying pan over medium-high heat. When oil is hot add burgers and cook 5 to 7 minutes per side or until done.